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Room temperature solution synthesis of hierarchical bow-like Cu2O with high visible light driven photocatalytic activity

2012; Royal Society of Chemistry; Volume: 2; Issue: 7 Linguagem: Inglês

10.1039/c2ra01197b

2046-2069

Xiangying Meng, Guohui Tian, Yajie Chen, Yang Qu, Juan Zhou, Kai Pan, Wei Zhou, Guoliang Zhang, Honggang Fu,

Advanced Photocatalysis Techniques

Novel hierarchical bow-like Cu2O crystals were successfully synthesized via a facile room temperature solution reaction using PVP as a structure-directing agent in the presence of NaBH4. The morphology evolution of the hierarchical bow-like Cu2O crystals were observed to be tunable as a function of reaction parameters, such as the reaction time, the quality of PVP and the reaction temperature. The possible growth mechanism of hierarchical bow-like Cu2O crystals was investigated. It involves the formation process of the intermediate octahedra Cu2O crystals and subsequent oxidation–erosion process from octahedra to hierarchical bow-like Cu2O crystals. It was found that the octahedra Cu2O crystals are a necessary intermediate for the formation of the bow-like Cu2O crystals. The prepared hierarchical bow-like Cu2O crystals exhibited a higher photocatalytic activity for photodegradation of rhodamine B aqueous solution under visible light illumination than the other prepared Cu2O crystal samples with different morphologies (nanoparticles and octahedra) because of its large surface area and specific hierarchical bow-like structure.